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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 7243692 | Chisel quickly adjusting and positioning device for a chiselling machine A chisel quickly adjusting and positioning device for a chiseling machine includes a plurality of separating members for adjusting a gap between a sleeve and the bottom of a machine body, and a chisel unit composed of a chisel and a drill fitting lengthwise in the c... | 07/17/2007 |
| 6267162 | Mortising tool A mortising tool designed to remove a specific quantity of material from a wooden object, such as a door or door jamb, to allow flush mounting of door hinge plates. The tool is comprised of a mortise forming member, a cutting device attached to the lower ... | 07/31/2001 |
| 4932450 | Corner cutting shear machine and method for forming inside corners in a one-piece article A machine and method for forming an inside corner portion in a one-piece article material where the inside corner portion is produced by the meeting at a corner of first and second adjacent profiles defined by grooves or members. The inside corner portion... | 06/12/1990 |
| 4235268 | Tool for forming door mortice A simple, inexpensive and easy to use tool for forming a rectangular mortice in either a door or a doorjamb. The tool comprises a U-shaped frame member adapted to be clamped to the edge of the door or doorjamb. Two sets of slots are formed in the frame, e... | 11/25/1980 |
